Check valves for water are a kind of protective valves for pipelines, which is designed to counter the change in flow of the medium in the return direction inside the process system. For example, if the pump fails, it will not allow the water to move in the opposite direction.
Check valves for water can be spring-loaded, ball, flanged, angled, petal. Their installation can be carried out on a vertical or horizontal pipeline section. Widespread use of these devices found in water intake systems from wells or wells using pumps, when the installation of an autonomous water supply system. They are also irreplaceable for sewer systems, since in the case of blockages it is possible to prevent the sewage water from flowing back. Check valves for water have such an important and special function as working in a mode not only normal operation, but also in an emergency situation.
If there is trouble in the water pipe in the form of leakage, shutting down the pump, reducing the pressure in a certain area, this device will serve as a sufficiently effective protection. Check valve for water, the price of which depends on the material of manufacture and varies between 300-1000 rubles, is simple enough in a constructive plan. It automatically closes, countering the movement of the flow in the opposite direction. Valves are made of steel, cast iron, brass and plastic. The devices made of stainless steel are famous for their high quality and excellent performance characteristics.
The wafer type single-leaf version features a wide range of possible ambient temperature conditions, fast installation, reliability, as well as excellent indicators of the maximum pressure that can be in the network. In order to avoid a change in flow direction in the pipeline, a two-leaf valve is installed. These devices do not use gaskets, because the body itself is equipped with additional seals. Check valves for water have a lot of advantages: light weight and length, high degree of tightness and reliability, and also easy to install.
According to the principle of operation this type of reinforcement is very simple. If there is no pressure and the flow rate in the pipeline is zero, then the locking element is in the closed position. This is achieved by its own weight or by means of a spring, which presses on it. If the flow rate is higher than zero, the saddle is opened by the locking element, ensuring fluid movement with minimal resistance. When the flow begins to return motion or stops, it is blocked by this element, which is pressed against the seat. The non - return valve for water plastic works in the same way as all other types. When using this type of reinforcement, it should be taken into account that the weight of the locking element and the force of the spring sometimes require the presence of excess pressure to open it.